| tag | description  | no. of articles |
|---|---|---|
| SSI - RADIATION INSTITUTE | Statens Strålskyddsinstitut, Sweden | 11 |
| SKI -INSPECTION | Statens Kärnkraft Inspectorate, Sweden | 52 |
| NPCIL, INDIA | state; owner and builder of nuclear power plant | 12 |
| TVEL | State-owned Russian Federation (fuel fabr / U prod.etc) | 25 |
| ENERGATOM | state, Ukraine | 22 |
| GOVERNMENT | State Directors (see parliament to parliament) | 1584 |
| ST.LUCY | St. Lucy, USA | 19 |
| SPRINGFIELDS, GB | Springfields, GB | 30 |
| ENRESA | Spanish waste storage company | 8 |
| ENDESA | Spanish energy company | 12 |
| IBERDROLA | Spanish company | 2 |
| CONFRENTES | Spain, BWR reactor near Valencia | 1 |
| ENUSA | Spain's uranium producer | 7 |
| SOUTHERN CROSS RESOURCES | Southern Cross Resources Inc. ; mining company | 21 |
| SOUTH TEXAS, USA | South Texas, USA | 64 |
| GYEONGJU | South Korea, where low / medium radioactive waste | 2 |
| NECSA | South African Nuclear Energy Corporation (formerly AEC) | 2 |
| VALINDABA | South Africa, plant for uranium enrichment | 3 |
| SOMALIA | Somalia, former Somaliland | 6 |
| SOMAIR | SOMAIR Société des Mines de l'Aïr, Niger | 3 |
| BREEDER REACTORS | Sodium cooled, current model | 510 |
| SODIUM | Sodium | 25 |
| SHTR | Societe pour les Réacteurs nucléaires HTR SA | 1 |
| SOCIA | Societe pour l'Industrie Atomique, French consortium | 2 |
| SICREL | Societe Industrielle de Combustibles pour Réacteurs Electrog | 1 |
| FBFC | Societe Franco-Belge de Fabrication de Combustible | 13 |
| SFEN | Société Française d'énergie nucléaire Paris | 2 |
| SABCA | Societe Anonyme Belge de Constructions Aeronautques | 2 |
| SOPREN | Societá Progettazione Reattori Nucleari, Italy | 1 |
| TIN | Sn-126 is long-lived fission product in HLW | 1 |
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